Question

我有这些表格：

员工（EmployeeID，NameSurname，PhoneNumber，Email）

合同（ContractID，日期， EmployeeID ，NameSurname）

我想在UPDATE for Contract表上创建触发器：当我更新Contract表中的“EmployeeID”时，应该从Employee表中相应地更新NameSurname。另外，我触发了“TBU_Contract_Prohib”，它不允许直接更改Contract中的NameSurname字段。我写了这个：

CREATE OR REPLACE TRIGGER "TBU_Contract"
 BEFORE UPDATE OF "EmployeeID" ON "Contract"
 FOR EACH ROW 
DECLARE
v_namesurname VARCHAR(50);
pragma autonomous_transaction;
  BEGIN
   EXECUTE immediate 'alter trigger "TBU_Contract_Prohib" disable';
   COMMIT;

   SELECT "NameSurname"
   INTO v_namesurname
   FROM "Employee"
   WHERE "EmployeeID" = :NEW."EmployeeID";

   UPDATE "Contract"
   SET "NameSurname"        = v_namesurname
   WHERE "EmployeeID" = :NEW."EmployeeID";

   EXECUTE immediate 'alter trigger " TBU_Contract_Prohib" enable';
   COMMIT;
  END;

这编译没有错误。但是，当我测试它时，例如：

UPDATE "Contract"
SET
"EmployeeID" = 2
WHERE
"ContractID" = 2;

我收到错误：

SQL Error: ORA-00060: deadlock detected while waiting for resource
ORA-06512: at "SYSTEM.TBU_Contract", line 14
ORA-04088: error during execution of trigger 'SYSTEM.TBU_Contract'
00060. 00000 -  "deadlock detected while waiting for resource"
*Cause:    Transactions deadlocked one another while waiting for resources.
*Action:   Look at the trace file to see the transactions and resources
           involved. Retry if necessary.

有什么问题，怎么可能让这项工作成功？

Answer 1

也许以下内容对您更有效：

raco setup

祝你好运。

Oracle触发器用于更新非规范化表

1 个答案: